    New chain ID            Original chain ID

9r87-pdb-bundle1.pdb:
           A                         A
           B                        A1
           C                        A2
           D                        A3
           E                        A4
           F                        Ar
           G                        As
           H                        At
           I                        Au
           J                        Av
           K                        Aw
           L                        Ax
           M                        Ay
           N                        Az
           O                         B
           P                         C
           Q                         D
           R                         E
           S                         F
           T                         G
           U                         H
           V                         I
           W                         J
           X                         K
           Y                         L
           Z                         M
           a                         N
           b                         O
           c                         P
           d                         Q
           e                         R
           f                         S
           g                         T
           h                         U
           i                         V
           j                         W
           k                         X
           l                         Y
           m                         Z
